the moderators can choose to remove someone who has joined the community in bad faith
unless you prevent new members from reading the chat history until given permission then they can already read everything before they are kicked out, and they can come back with a different account.
you also can not detect people acting in bad faith if all they do is read.
basically, you can't expect privacy if you don't limit members to people you know and trust. that goes for any group chat, encrypted or not.
i also doubt that discord chatlogs are encrypted on their servers.
What is your point? I feel I made the one you are making before you even responded the first time.
That Discord communications can be exfiltrated in this specific set of circumstances (again, something I already said) does little to change that Colibri is implemented in the least privacy preserving way possible, short of publishing directly to every news and intelligence agency on your behalf, and does little to make that very clear in the first place.
you said: Users in a Discord server/local community on tools like Discord naturally expect that their actions within that community are private in so far as they trust everyone in the community (including the operator) to keep it so.
my point is: you don't get that in a public discord. and i believe that most discord servers, those for games anyways are public. only small team discord servers are private. privacy on discord is an illusion. i also would not trust discord to keep any messages private even from a private server.
you seem to imply that just by looking like discord colibri promises the same privacy options as discord. why? colibri does not present itself as a discord alternative. and although the line "privacy when needed" was misleading, in the FAQ they clarified that there is no private data. (to be sure i checked the site as it was 2 weeks ago: https://web.archive.org/web/20260311020805/https://colibri.s... )